Carbonated water injection (CWI)–A productive way of using CO2 for oil recovery and CO2 storage

Soaking effect on miscible CO2 flooding in a tight sandstone formation

“…Also CO 2 -WAG injection is difficult to apply as the water injectivity in a tight oil formation is rather low [14]. Similarly, carbonated waterflooding also combines the technical advantages of waterflooding and CO 2 flooding together by dissolving CO 2 into water prior to its injection [15]. The actual performance of carbonated waterflooding is considerably compromised because of a low solubility of CO 2 in water and also a low injectivity of carbonated water in a tight oil formation.…”

Suggesting a numerical pressure-decay method for determining CO2 diffusion coefficient in water

“…This is so important that many of the previous papers worked on this issue somehow. Strategies such as carbonated water injection [13][14][15], ex situ dissolution approach [16,17], static mixer [18], injecting brine on top of the injected CO 2 [19], hydraulic fractures in the injection wells [20] and using horizontal injection wells in the absence of chase brine injection [20] are some examples. Here, we focus on determining CO 2 diffusion coefficient (DC) using an experimental model.…”

CO2 mobility control and sweep efficiency improvement using starch gel or ethylenediamine in ultra-low permeability oil layers with different types of heterogeneity

“…Surfactant alternating gas (SAG) flooding and foam assisted water alternating gas (FAWAG) flooding are other methods used to delay gas breakthrough during CO 2 flooding (Spirov et al, 2012;Salehi et al, 2014). Carbonated water injection (CWI) was proposed to be an alternative CO 2 injection strategy which could solve the problems of gravity segregation and poor sweep efficiency (Sohrabi et al, 2011).…”